Blar i Institutt for materialteknologi på utgivelsesdato

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    • Cyclodextrin inhibits zinc corrosion by destabilizing point defect formation in the oxide layer 

      Altin, Abdulrahman; Krzywiecki, Maciej; Sarfraz, Adnan; Toparli, Cigdem; Laska, Claudius; Kerger, Philipp; Zeradjanin, Aleksandar; Mayrhofer, Karl J.J.; Rohwerder, Michael; Erbe, Andreas (Journal article; Peer reviewed, 2018)
      Corrosion inhibitors are added in low concentrations to corrosive solutions for reducing the corrosion rate of a metallic material. Their mechanism of action is typically the blocking of free metal surface by adsorption, ...

    • Hydrothermal syntheis and characterization of BaTiO3 nanoparticles 

      Hempel, Frida Sveen (Master thesis, 2018)
      This thesis investigates the size dependent dipole disorder in ferroelectric materials, which leads to a loss of macroscopic ferroelectricity, and the role of the depolarization field on this disorder. Structural ...

    • Frequency dependent polarisation switching in h-ErMnO3 

      Ruff, Alexander; Li, Ziyu; Loidl, Alois; Schaab, Jakob; Fiebig, Manfred; Cano, Andres; Yan, Zewu; Bourret, Edith; Glaum, Julia; Meier, Dennis; Krohns, Stephan (Journal article; Peer reviewed, 2018)
      We report an electric-field poling study of the geometric-driven improper ferroelectric h-ErMnO3. From a detailed dielectric analysis we deduce the temperature and frequency dependent range for which single-crystalline ...

    • Defect chemistry and ferroelectric domain walls in hexagonal manganites 

      Småbråten, Didrik René (Doctoral theses at NTNU;2018:263, Doctoral thesis, 2018)
      The hexagonal manganites h-RMnO3 (R=Y, In, Sc, Ho-Lu) have been studied the last two decades for their exotic and diverse functional properties. Their large chemical flexibility makes this material class an ideal chemical ...

    • Electrolyte Melt Compositions for Low Temperature Molten Carbonate Thermocell 

      Kandhasamy, Sathiyaraj; Solheim, Asbjørn; Kjelstrup, Signe; Haarberg, Geir Martin (Journal article; Peer reviewed, 2018)
      Industrial processes for the production of metals and alloys by metallurgical and electrochemical methods generate a great deal of waste heat due to irreversible losses. This waste heat may be used as a power source to ...

    • Electrical half-wave rectification at ferroelectric domain walls 

      Schaab, Jakob; Skjærvø, Sandra Helen; Krohns, Stephan; Dai, Xiaoyu; Holtz, Megan, E.; Cano, Andrés; Lilienblum, Martin; Yan, Zewu; Bourret, Edith; Muller, David A.; Fiebig, Manfred; Selbach, Sverre Magnus; Meier, Dennis (Journal article; Peer reviewed, 2018)
      Domain walls in ferroelectric semiconductors show promise as multifunctional two-dimensional elements for next-generation nanotechnology. Electric fields, for example, can control the direct-current resistance and reversibly ...

    • Recycling of Fine Silicon Particles for Solar Grade Silicon Production 

      Wermers, Matthew Engel (Master thesis, 2018)
      The production of solar grade silicon wafers results in 50% wasted silicon. Due to the high volume of waste, recycling the fines into a useable material allows for use of all this valuable silicon. Currently there is no ...

    • Effect of porosity on the ferroelectric and piezoelectric properties of (Ba0.85Ca0.15)(Zr0.1Ti0.9)O3 piezoelectric ceramics 

      Yap, Emily; Glaum, Julia; Oddershede, Jette; Daniels, John E. (Peer reviewed; Journal article, 2018)
      The ferroelectric and piezoelectric properties of (Ba0.85Ca0.15)(Zr0.1Ti0.9)O3 (BCZT) ceramics were measured as a function of porosity. Porous BCZT ceramics were fabricated using the sacrificial fugitive technique. Two ...

    • A simplified three-phase model of equiaxed solidification for the prediction of microstructure and macrosegregation in castings 

      Tveito, Knut Omdal; Pakanati, Akash; M'hamdi, Mohammed; Combeau, Hervé; Založnik, Miha (Journal article, 2018)
      Macrosegregation is a result of the interplay of various transport mechanisms, including natural convection, solidification shrinkage, and grain motion. Experimental observations also indicate the impact of grain morphology, ...

    • Element distribution in the silicomanganese production process 

      Ma, Yan; Moosavi-Khoonsari, Elmira; Kero, Ida; Tranell, Gabriella (Journal article; Peer reviewed, 2018)
      A pilot scale, silicomanganese alloy production campaign was performed in a 440 kVA, single phase electric furnace in order to establish an overview of the minor- and trace element contents in process input raw materials ...

    • XPS Examination of the Oxide-Metal Interface of an Aluminum-Magnesium Alloy Containing Beryllium 

      Smith, Nicholas; Kvithyld, Anne; Tranell, Gabriella (Chapter, 2018)
      The addition of beryllium to high magnesium aluminum alloys has long been known to cause a significant decrease in the rate of alloy oxidation. A clear understanding of the fundamental mechanism behind this effect is still ...

    • 96Zr Tracer Diffusion in AZro3 (A = Ca, Sr, Ba) 

      Sazinas, Rokas; Sakaguchi, Isao; Einarsrud, Mari-Ann; Grande, Tor (Journal article; Peer reviewed, 2018)
      Cation tracer diffusion in polycrystalline AZrO3 (A = Ca, Sr, Ba) perovskites was studied at 1300–1500 °C in air using the stable isotope 96Zr. Thin films of 96ZrO2 were deposited on polished ceramic pellets by drop casting ...

    • Coalescence of Clean, Coated, and Decoated Aluminum for Various Salts, and Salt–Scrap Ratios 

      Capuzzi, Stefano; Kvithyld, Anne; Timelli, Giulio; Nordmark, Arne; Gumbmann, Eva Maria; Engh, Thorvald Abel (Journal article, 2018)
      In a rotary furnace for aluminum recycling and dross treatment, a salt flux covers the molten metal to prevent new oxidation and to capture oxides, and impurities contained in the scrap. Furthermore, the salt must promote ...

    • Recycling and Utilisation of Secondary Aluminium Products 

      Meling, Ingrid (Master thesis, 2018)
      Efficient utilisation of secondary aluminium products is increasingly important as the energy consumption and CO2 emissions are greatly reduced by recycling compared to primary production. The aim of this study was to ...

    • Thermoelectric properties of Cu2Se1−xTex solid solutions 

      Zhao, Kunpeng; Guan, Mengjia; Qiu, Pengfei; Blichfeld, Anders Bank; Eikeland, Espen; Zhu, Chenxi; Ren, Dudi; Xu, Fangfang; Iversen, Bo B; Xun, Shi; Chen, Lidong (Journal article, 2018)
      Binary Cu2Se and Cu2Te have gained great attention recently because of their interesting and abnormal physical properties, such as ultralow thermal conductivity, high carrier mobility, large effective mass of carriers and ...

    • New Insights into Computational Fluid Dynamic Modeling of the Resistivity and Overpotential in Reverse Electrodialysis 

      Jalili, Zohreh; Burheim, Odne Stokke; Einarsrud, Kristian Etienne (Journal article; Peer reviewed, 2018)
      The resulting electrical potential of a reverse electrodialysis is reduced both due to ohmic and non-ohmic resistances. The non-ohmic resistance is mainly controlled by concentration polarization which is a considerable ...

    • Reduction Rates of SiMn Slags from Various Raw Materials 

      Kim, Pyunghwa Peace (Doctoral theses at NTNU;2018:260, Doctoral thesis, 2018)

    • The oxygen evolution reaction mechanism at IrxRu1−xO2 powders produced by hydrolysis synthesis 

      Reksten, Anita; Thuv, Heidi; Seland, Frode; Sunde, Svein (Journal article; Peer reviewed, 2018)
      A mechanistic study of the oxygen evolution reaction (OER) has been performed for IrxRu1−xO2, x = 1, 0.6, 0.3 and 0, prepared by the hydrolysis synthesis. The oxides were characterized by X-ray diffraction, cyclic voltammetry ...

    • Grain Refinement of Commercial EC Grade 1370 Aluminium Alloy for Electrical Applications 

      Hassanabadi, Massoud; Akhtar, Shahid; Arnberg, Lars; Aune, Ragnhild E. (Journal article; Peer reviewed, 2018)
      The purpose of the present study was to investigate the effect of different grain refiners’ additions on structure and electrical conductivity of commercially electrically conductive (EC) grade 1370 aluminium alloy. A ...

    • A study of anode baking gas composition 

      Aarhaug, Thor Anders; Brandvik, Trond; Kjos, Ole Sigmund; Gaertner, Heiko; Ratvik, Arne Petter (Journal article; Peer reviewed, 2018)
      A method has been developed to measure gas composition inside the pit in open anode baking furnaces. The gas composition can be used to understand attack on and degradation of the refractory lining, baking behavior and ...